Schwalbe Fat Franks in 26x2.35 literally fall off a 26in rim. I don't know how they even clinch. You can put 10psi in the tube and they still flap about. Can pass a finger between the tyre and rim. This on three different designs of rim. Yet with enough pressure it automatically seats evenly.

But recently I had to remove Schwalbe marathons from their rims Brompton size 16 3/8, 349mm. Bent the tyre levers and scratched the rims. It was like they were just too small. I'm converting those wheels to 355, the Schwalbe Big Apples in 2.0in go on very easily.